a cone and a frustum to represent a spotlight. More...

#include <vtkLightActor.h>

Inheritance diagram for vtkLightActor:

Collaboration diagram for vtkLightActor:

Public Types
typedef vtkProp3D	Superclass

Public Types inherited from vtkProp3D
typedef vtkProp	Superclass

Public Types inherited from vtkProp
typedef vtkObject	Superclass

Public Member Functions
virtual vtkTypeBool	IsA (const char *type)
	Return 1 if this class is the same type of (or a subclass of) the named class. More...

vtkLightActor *	NewInstance () const

void	PrintSelf (ostream &os, vtkIndent indent) override
	Methods invoked by print to print information about the object including superclasses. More...

int	RenderOpaqueGeometry (vtkViewport *viewport) override
	Support the standard render methods. More...

vtkTypeBool	HasTranslucentPolygonalGeometry () override
	Does this prop have some translucent polygonal geometry? No. More...

void	ReleaseGraphicsResources (vtkWindow *) override
	Release any graphics resources that are being consumed by this actor. More...

double *	GetBounds () override
	Get the bounds for this Actor as (Xmin,Xmax,Ymin,Ymax,Zmin,Zmax). More...

vtkMTimeType	GetMTime () override
	Get the actors mtime plus consider its properties and texture if set. More...


void	SetLight (vtkLight *light)
	The spotlight to represent. More...

virtual vtkLight *	GetLight ()
	The spotlight to represent. More...


void	SetClippingRange (double dNear, double dFar)
	Set/Get the location of the near and far clipping planes along the direction of projection. More...

void	SetClippingRange (const double a[2])
	Set/Get the location of the near and far clipping planes along the direction of projection. More...

virtual double *	GetClippingRange ()
	Set/Get the location of the near and far clipping planes along the direction of projection. More...

virtual void	GetClippingRange (double &, double &)
	Set/Get the location of the near and far clipping planes along the direction of projection. More...

virtual void	GetClippingRange (double[2])
	Set/Get the location of the near and far clipping planes along the direction of projection. More...

Public Member Functions inherited from vtkProp3D
vtkProp3D *	NewInstance () const

void	PrintSelf (ostream &os, vtkIndent indent) override
	Methods invoked by print to print information about the object including superclasses. More...

void	ShallowCopy (vtkProp *prop) override
	Shallow copy of this vtkProp3D. More...

virtual void	SetPosition (double pos[3])

virtual double *	GetPosition ()

virtual void	GetPosition (double data[3])

void	AddPosition (double deltaPosition[3])

void	AddPosition (double deltaX, double deltaY, double deltaZ)

void	SetScale (double s)
	Method to set the scale isotropically. More...

double *	GetCenter ()
	Get the center of the bounding box in world coordinates. More...

double *	GetXRange ()
	Get the Prop3D's x range in world coordinates. More...

double *	GetYRange ()
	Get the Prop3D's y range in world coordinates. More...

double *	GetZRange ()
	Get the Prop3D's z range in world coordinates. More...

double	GetLength ()
	Get the length of the diagonal of the bounding box. More...

void	RotateX (double)
	Rotate the Prop3D in degrees about the X axis using the right hand rule. More...

void	RotateY (double)
	Rotate the Prop3D in degrees about the Y axis using the right hand rule. More...

void	RotateZ (double)
	Rotate the Prop3D in degrees about the Z axis using the right hand rule. More...

void	RotateWXYZ (double w, double x, double y, double z)
	Rotate the Prop3D in degrees about an arbitrary axis specified by the last three arguments. More...

void	SetOrientation (double x, double y, double z)
	Sets the orientation of the Prop3D. More...

void	SetOrientation (double orientation[3])
	Sets the orientation of the Prop3D. More...

double *	GetOrientationWXYZ ()
	Returns the WXYZ orientation of the Prop3D. More...

void	AddOrientation (double x, double y, double z)
	Add to the current orientation. More...

void	AddOrientation (double orentation[3])
	Add to the current orientation. More...

void	PokeMatrix (vtkMatrix4x4 *matrix) override
	This method modifies the vtkProp3D so that its transformation state is set to the matrix specified. More...

void	InitPathTraversal () override
	Overload vtkProp's method for setting up assembly paths. More...

vtkMTimeType	GetMTime () override
	Get the vtkProp3D's mtime. More...

vtkMTimeType	GetUserTransformMatrixMTime ()
	Get the modified time of the user matrix or user transform. More...

virtual void	ComputeMatrix ()
	Generate the matrix based on ivars. More...

virtual void	SetPosition (double x, double y, double z)
	Set/Get/Add the position of the Prop3D in world coordinates. More...

virtual void	SetOrigin (double x, double y, double z)
	Set/Get the origin of the Prop3D. More...

virtual void	SetOrigin (const double pos[3])
	Set/Get the origin of the Prop3D. More...

virtual double *	GetOrigin ()
	Set/Get the origin of the Prop3D. More...

virtual void	GetOrigin (double data[3])
	Set/Get the origin of the Prop3D. More...

virtual void	SetScale (double x, double y, double z)
	Set/Get the scale of the actor. More...

virtual void	SetScale (double scale[3])
	Set/Get the scale of the actor. More...

virtual double *	GetScale ()
	Set/Get the scale of the actor. More...

virtual void	GetScale (double data[3])
	Set/Get the scale of the actor. More...

void	SetUserTransform (vtkLinearTransform *transform)
	In addition to the instance variables such as position and orientation, you can add an additional transformation for your own use. More...

virtual vtkLinearTransform *	GetUserTransform ()
	In addition to the instance variables such as position and orientation, you can add an additional transformation for your own use. More...

void	SetUserMatrix (vtkMatrix4x4 *matrix)
	The UserMatrix can be used in place of UserTransform. More...

vtkMatrix4x4 *	GetUserMatrix ()
	The UserMatrix can be used in place of UserTransform. More...

virtual void	GetMatrix (vtkMatrix4x4 *m)
	Return a reference to the Prop3D's 4x4 composite matrix. More...

virtual void	GetMatrix (double m[16])
	Return a reference to the Prop3D's 4x4 composite matrix. More...

void	GetBounds (double bounds[6])
	Return a reference to the Prop3D's composite transform. More...

double *	GetOrientation ()
	Returns the orientation of the Prop3D as s vector of X,Y and Z rotation. More...

void	GetOrientation (double orentation[3])
	Returns the orientation of the Prop3D as s vector of X,Y and Z rotation. More...

vtkMatrix4x4 *	GetMatrix () override
	Get a pointer to an internal vtkMatrix4x4. More...

virtual int	GetIsIdentity ()
	Is the matrix for this actor identity. More...

Public Member Functions inherited from vtkProp
vtkProp *	NewInstance () const

virtual void	GetActors (vtkPropCollection *)
	For some exporters and other other operations we must be able to collect all the actors or volumes. More...

virtual void	GetActors2D (vtkPropCollection *)

virtual void	GetVolumes (vtkPropCollection *)

virtual void	Pick ()
	Method fires PickEvent if the prop is picked. More...

virtual vtkMTimeType	GetRedrawMTime ()
	Return the mtime of anything that would cause the rendered image to appear differently. More...

virtual void	PokeMatrix (vtkMatrix4x4 *vtkNotUsed(matrix))
	These methods are used by subclasses to place a matrix (if any) in the prop prior to rendering. More...

virtual bool	HasKeys (vtkInformation *requiredKeys)
	Tells if the prop has all the required keys. More...

virtual int	RenderTranslucentPolygonalGeometry (vtkViewport *)

virtual int	RenderVolumetricGeometry (vtkViewport *)

virtual int	RenderOverlay (vtkViewport *)

virtual bool	RenderFilteredOpaqueGeometry (vtkViewport v, vtkInformation requiredKeys)
	Render the opaque geometry only if the prop has all the requiredKeys. More...

virtual bool	RenderFilteredTranslucentPolygonalGeometry (vtkViewport v, vtkInformation requiredKeys)
	Render the translucent polygonal geometry only if the prop has all the requiredKeys. More...

virtual bool	RenderFilteredVolumetricGeometry (vtkViewport v, vtkInformation requiredKeys)
	Render the volumetric geometry only if the prop has all the requiredKeys. More...

virtual bool	RenderFilteredOverlay (vtkViewport v, vtkInformation requiredKeys)
	Render in the overlay of the viewport only if the prop has all the requiredKeys. More...

virtual double	GetEstimatedRenderTime (vtkViewport *)
	WARNING: INTERNAL METHOD - NOT INTENDED FOR GENERAL USE DO NOT USE THESE METHODS OUTSIDE OF THE RENDERING PROCESS The EstimatedRenderTime may be used to select between different props, for example in LODProp it is used to select the level-of-detail. More...

virtual double	GetEstimatedRenderTime ()

virtual void	SetEstimatedRenderTime (double t)
	WARNING: INTERNAL METHOD - NOT INTENDED FOR GENERAL USE DO NOT USE THESE METHODS OUTSIDE OF THE RENDERING PROCESS This method is used by, for example, the vtkLODProp3D in order to initialize the estimated render time at start-up to some user defined value. More...

virtual void	RestoreEstimatedRenderTime ()
	WARNING: INTERNAL METHOD - NOT INTENDED FOR GENERAL USE DO NOT USE THESE METHODS OUTSIDE OF THE RENDERING PROCESS When the EstimatedRenderTime is first set to 0.0 (in the SetAllocatedRenderTime method) the old value is saved. More...

virtual void	AddEstimatedRenderTime (double t, vtkViewport *vtkNotUsed(vp))
	WARNING: INTERNAL METHOD - NOT INTENDED FOR GENERAL USE DO NOT USE THIS METHOD OUTSIDE OF THE RENDERING PROCESS This method is intended to allow the renderer to add to the EstimatedRenderTime in props that require information that the renderer has in order to do this. More...

void	SetRenderTimeMultiplier (double t)
	WARNING: INTERNAL METHOD - NOT INTENDED FOR GENERAL USE DO NOT USE THIS METHOD OUTSIDE OF THE RENDERING PROCESS Get/Set the multiplier for the render time. More...

virtual double	GetRenderTimeMultiplier ()

virtual void	BuildPaths (vtkAssemblyPaths paths, vtkAssemblyPath path)
	WARNING: INTERNAL METHOD - NOT INTENDED FOR GENERAL USE DO NOT USE THIS METHOD OUTSIDE OF THE RENDERING PROCESS Used to construct assembly paths and perform part traversal. More...

virtual bool	GetSupportsSelection ()
	WARNING: INTERNAL METHOD - NOT INTENDED FOR GENERAL USE DO NOT USE THIS METHOD OUTSIDE OF THE RENDERING PROCESS Used by vtkHardwareSelector to determine if the prop supports hardware selection. More...

virtual void	ProcessSelectorPixelBuffers (vtkHardwareSelector *, std::vector< unsigned int > &)
	allows a prop to update a selections color buffers More...

virtual void	SetVisibility (vtkTypeBool)
	Set/Get visibility of this vtkProp. More...

virtual vtkTypeBool	GetVisibility ()
	Set/Get visibility of this vtkProp. More...

virtual void	VisibilityOn ()
	Set/Get visibility of this vtkProp. More...

virtual void	VisibilityOff ()
	Set/Get visibility of this vtkProp. More...

virtual void	SetPickable (vtkTypeBool)
	Set/Get the pickable instance variable. More...

virtual vtkTypeBool	GetPickable ()
	Set/Get the pickable instance variable. More...

virtual void	PickableOn ()
	Set/Get the pickable instance variable. More...

virtual void	PickableOff ()
	Set/Get the pickable instance variable. More...

virtual void	SetDragable (vtkTypeBool)
	Set/Get the value of the dragable instance variable. More...

virtual vtkTypeBool	GetDragable ()
	Set/Get the value of the dragable instance variable. More...

virtual void	DragableOn ()
	Set/Get the value of the dragable instance variable. More...

virtual void	DragableOff ()
	Set/Get the value of the dragable instance variable. More...

virtual void	SetUseBounds (bool)
	In case the Visibility flag is true, tell if the bounds of this prop should be taken into account or ignored during the computation of other bounding boxes, like in vtkRenderer::ResetCamera(). More...

virtual bool	GetUseBounds ()
	In case the Visibility flag is true, tell if the bounds of this prop should be taken into account or ignored during the computation of other bounding boxes, like in vtkRenderer::ResetCamera(). More...

virtual void	UseBoundsOn ()
	In case the Visibility flag is true, tell if the bounds of this prop should be taken into account or ignored during the computation of other bounding boxes, like in vtkRenderer::ResetCamera(). More...

virtual void	UseBoundsOff ()
	In case the Visibility flag is true, tell if the bounds of this prop should be taken into account or ignored during the computation of other bounding boxes, like in vtkRenderer::ResetCamera(). More...

virtual vtkAssemblyPath *	GetNextPath ()
	vtkProp and its subclasses can be picked by subclasses of vtkAbstractPicker (e.g., vtkPropPicker). More...

virtual int	GetNumberOfPaths ()
	vtkProp and its subclasses can be picked by subclasses of vtkAbstractPicker (e.g., vtkPropPicker). More...

virtual vtkInformation *	GetPropertyKeys ()
	Set/Get property keys. More...

virtual void	SetPropertyKeys (vtkInformation *keys)
	Set/Get property keys. More...

virtual void	SetAllocatedRenderTime (double t, vtkViewport *vtkNotUsed(v))
	WARNING: INTERNAL METHOD - NOT INTENDED FOR GENERAL USE DO NOT USE THIS METHOD OUTSIDE OF THE RENDERING PROCESS The renderer may use the allocated rendering time to determine how to render this actor. More...

virtual double	GetAllocatedRenderTime ()
	WARNING: INTERNAL METHOD - NOT INTENDED FOR GENERAL USE DO NOT USE THIS METHOD OUTSIDE OF THE RENDERING PROCESS. More...

virtual int	GetNumberOfConsumers ()
	Get the number of consumers. More...

void	AddConsumer (vtkObject *c)
	Add or remove or get or check a consumer,. More...

void	RemoveConsumer (vtkObject *c)
	Add or remove or get or check a consumer,. More...

vtkObject *	GetConsumer (int i)
	Add or remove or get or check a consumer,. More...

int	IsConsumer (vtkObject *c)
	Add or remove or get or check a consumer,. More...

Public Member Functions inherited from vtkObject
	vtkBaseTypeMacro (vtkObject, vtkObjectBase)

virtual void	DebugOn ()
	Turn debugging output on. More...

virtual void	DebugOff ()
	Turn debugging output off. More...

bool	GetDebug ()
	Get the value of the debug flag. More...

void	SetDebug (bool debugFlag)
	Set the value of the debug flag. More...

virtual void	Modified ()
	Update the modification time for this object. More...

void	RemoveObserver (unsigned long tag)

void	RemoveObservers (unsigned long event)

void	RemoveObservers (const char *event)

void	RemoveAllObservers ()

vtkTypeBool	HasObserver (unsigned long event)

vtkTypeBool	HasObserver (const char *event)

int	InvokeEvent (unsigned long event)

int	InvokeEvent (const char *event)

unsigned long	AddObserver (unsigned long event, vtkCommand *, float priority=0.0f)
	Allow people to add/remove/invoke observers (callbacks) to any VTK object. More...

unsigned long	AddObserver (const char event, vtkCommand , float priority=0.0f)
	Allow people to add/remove/invoke observers (callbacks) to any VTK object. More...

vtkCommand *	GetCommand (unsigned long tag)
	Allow people to add/remove/invoke observers (callbacks) to any VTK object. More...

void	RemoveObserver (vtkCommand *)
	Allow people to add/remove/invoke observers (callbacks) to any VTK object. More...

void	RemoveObservers (unsigned long event, vtkCommand *)
	Allow people to add/remove/invoke observers (callbacks) to any VTK object. More...

void	RemoveObservers (const char event, vtkCommand )
	Allow people to add/remove/invoke observers (callbacks) to any VTK object. More...

vtkTypeBool	HasObserver (unsigned long event, vtkCommand *)
	Allow people to add/remove/invoke observers (callbacks) to any VTK object. More...

vtkTypeBool	HasObserver (const char event, vtkCommand )
	Allow people to add/remove/invoke observers (callbacks) to any VTK object. More...

template<class U , class T >
unsigned long	AddObserver (unsigned long event, U observer, void(T::*callback)(), float priority=0.0f)
	Overloads to AddObserver that allow developers to add class member functions as callbacks for events. More...

template<class U , class T >
unsigned long	AddObserver (unsigned long event, U observer, void(T::callback)(vtkObject , unsigned long, void *), float priority=0.0f)
	Overloads to AddObserver that allow developers to add class member functions as callbacks for events. More...

template<class U , class T >
unsigned long	AddObserver (unsigned long event, U observer, bool(T::callback)(vtkObject , unsigned long, void *), float priority=0.0f)
	Allow user to set the AbortFlagOn() with the return value of the callback method. More...

int	InvokeEvent (unsigned long event, void *callData)
	This method invokes an event and return whether the event was aborted or not. More...

int	InvokeEvent (const char event, void callData)
	This method invokes an event and return whether the event was aborted or not. More...

Public Member Functions inherited from vtkObjectBase
const char *	GetClassName () const
	Return the class name as a string. More...

virtual void	Delete ()
	Delete a VTK object. More...

virtual void	FastDelete ()
	Delete a reference to this object. More...

void	InitializeObjectBase ()

void	Print (ostream &os)
	Print an object to an ostream. More...

virtual void	Register (vtkObjectBase *o)
	Increase the reference count (mark as used by another object). More...

virtual void	UnRegister (vtkObjectBase *o)
	Decrease the reference count (release by another object). More...

int	GetReferenceCount ()
	Return the current reference count of this object. More...

void	SetReferenceCount (int)
	Sets the reference count. More...

void	PrintRevisions (ostream &)
	Legacy. More...

virtual void	PrintHeader (ostream &os, vtkIndent indent)
	Methods invoked by print to print information about the object including superclasses. More...

virtual void	PrintTrailer (ostream &os, vtkIndent indent)
	Methods invoked by print to print information about the object including superclasses. More...

Static Public Member Functions
static vtkLightActor *	New ()

static vtkTypeBool	IsTypeOf (const char *type)

static vtkLightActor *	SafeDownCast (vtkObjectBase *o)

Static Public Member Functions inherited from vtkProp3D
static vtkTypeBool	IsTypeOf (const char *type)

static vtkProp3D *	SafeDownCast (vtkObjectBase *o)

Static Public Member Functions inherited from vtkProp
static vtkTypeBool	IsTypeOf (const char *type)

static vtkProp *	SafeDownCast (vtkObjectBase *o)

static vtkInformationIntegerKey *	GeneralTextureUnit ()
	Optional Key Indicating the texture unit for general texture mapping Old OpenGL was a state machine where you would push or pop items. More...

static vtkInformationDoubleVectorKey *	GeneralTextureTransform ()
	Optional Key Indicating the texture transform for general texture mapping Old OpenGL was a state machine where you would push or pop items. More...

Static Public Member Functions inherited from vtkObject
static vtkObject *	New ()
	Create an object with Debug turned off, modified time initialized to zero, and reference counting on. More...

static void	BreakOnError ()
	This method is called when vtkErrorMacro executes. More...

static void	SetGlobalWarningDisplay (int val)
	This is a global flag that controls whether any debug, warning or error messages are displayed. More...

static void	GlobalWarningDisplayOn ()
	This is a global flag that controls whether any debug, warning or error messages are displayed. More...

static void	GlobalWarningDisplayOff ()
	This is a global flag that controls whether any debug, warning or error messages are displayed. More...

static int	GetGlobalWarningDisplay ()
	This is a global flag that controls whether any debug, warning or error messages are displayed. More...

Static Public Member Functions inherited from vtkObjectBase
static vtkTypeBool	IsTypeOf (const char *name)
	Return 1 if this class type is the same type of (or a subclass of) the named class. More...

static vtkObjectBase *	New ()
	Create an object with Debug turned off, modified time initialized to zero, and reference counting on. More...

Protected Member Functions
virtual vtkObjectBase *	NewInstanceInternal () const

	vtkLightActor ()

	~vtkLightActor () override

void	UpdateViewProps ()

Protected Member Functions inherited from vtkProp3D
	vtkProp3D ()

	~vtkProp3D () override

Protected Member Functions inherited from vtkProp
	vtkProp ()

	~vtkProp () override

Protected Member Functions inherited from vtkObject
	vtkObject ()

	~vtkObject () override

void	RegisterInternal (vtkObjectBase *, vtkTypeBool check) override

void	UnRegisterInternal (vtkObjectBase *, vtkTypeBool check) override

void	InternalGrabFocus (vtkCommand mouseEvents, vtkCommand keypressEvents=nullptr)
	These methods allow a command to exclusively grab all events. More...

void	InternalReleaseFocus ()
	These methods allow a command to exclusively grab all events. More...

Protected Member Functions inherited from vtkObjectBase
	vtkObjectBase ()

virtual	~vtkObjectBase ()

virtual void	CollectRevisions (ostream &)

virtual void	ReportReferences (vtkGarbageCollector *)

	vtkObjectBase (const vtkObjectBase &)

void	operator= (const vtkObjectBase &)

Protected Attributes
vtkLight *	Light

double	ClippingRange [2]

vtkConeSource *	ConeSource

vtkPolyDataMapper *	ConeMapper

vtkActor *	ConeActor

vtkCamera *	CameraLight

vtkCameraActor *	FrustumActor

vtkBoundingBox *	BoundingBox

Protected Attributes inherited from vtkProp3D
vtkLinearTransform *	UserTransform

vtkMatrix4x4 *	UserMatrix

vtkMatrix4x4 *	Matrix

vtkTimeStamp	MatrixMTime

double	Origin [3]

double	Position [3]

double	Orientation [3]

double	Scale [3]

double	Center [3]

vtkTransform *	Transform

double	Bounds [6]

vtkProp3D *	CachedProp3D

int	IsIdentity

Protected Attributes inherited from vtkProp
vtkTypeBool	Visibility

vtkTypeBool	Pickable

vtkTypeBool	Dragable

bool	UseBounds

double	AllocatedRenderTime

double	EstimatedRenderTime

double	SavedEstimatedRenderTime

double	RenderTimeMultiplier

int	NumberOfConsumers

vtkObject **	Consumers

vtkAssemblyPaths *	Paths

vtkInformation *	PropertyKeys

Protected Attributes inherited from vtkObject
bool	Debug

vtkTimeStamp	MTime

vtkSubjectHelper *	SubjectHelper

Protected Attributes inherited from vtkObjectBase
vtkAtomicInt32	ReferenceCount

vtkWeakPointerBase **	WeakPointers

Detailed Description

a cone and a frustum to represent a spotlight.

vtkLightActor is a composite actor used to represent a spotlight. The cone angle is equal to the spotlight angle, the cone apex is at the position of the light, the direction of the light goes from the cone apex to the center of the base of the cone. The square frustum position is the light position, the frustum focal point is in the direction of the light direction. The frustum vertical view angle (aperture) (this is also the horizontal view angle as the frustum is square) is equal to twice the cone angle. The clipping range of the frustum is arbitrary set by the user (initially at 0.5,11.0).

Warning: Right now only spotlight are supported but directional light might be supported in the future.

See also: vtkLight vtkConeSource vtkFrustumSource vtkCameraActor

Tests:: vtkLightActor (Tests)

Definition at line 54 of file vtkLightActor.h.

Member Typedef Documentation

typedef vtkProp3D vtkLightActor::Superclass

Definition at line 58 of file vtkLightActor.h.

Constructor & Destructor Documentation

vtkLightActor::vtkLightActor ( )

protected

vtkLightActor::~vtkLightActor ( )

overrideprotected

Member Function Documentation

static vtkLightActor* vtkLightActor::New ( )

static

static vtkTypeBool vtkLightActor::IsTypeOf ( const char * type )

static

virtual vtkTypeBool vtkLightActor::IsA ( const char * name )

virtual

Return 1 if this class is the same type of (or a subclass of) the named class.

Returns 0 otherwise. This method works in combination with vtkTypeMacro found in vtkSetGet.h.

Reimplemented from vtkProp3D.

static vtkLightActor* vtkLightActor::SafeDownCast ( vtkObjectBase * o )

static

virtual vtkObjectBase* vtkLightActor::NewInstanceInternal ( ) const

protectedvirtual

Reimplemented from vtkProp3D.

vtkLightActor* vtkLightActor::NewInstance ( ) const

void vtkLightActor::PrintSelf	(	ostream &	os,
		vtkIndent	indent
	)

overridevirtual

Methods invoked by print to print information about the object including superclasses.

Typically not called by the user (use Print() instead) but used in the hierarchical print process to combine the output of several classes.

Reimplemented from vtkObject.

void vtkLightActor::SetLight ( vtkLight * light )

The spotlight to represent.

Initial value is NULL.

virtual vtkLight* vtkLightActor::GetLight ( )

virtual

The spotlight to represent.

Initial value is NULL.

void vtkLightActor::SetClippingRange	(	double	dNear,
		double	dFar
	)

Set/Get the location of the near and far clipping planes along the direction of projection.